Wearable display: "A proposition is to provide a wearable display suitable for enjoying contents including images by plural users simultaneously. To realize the proposition, the wearable display provides an external output unit outputting a signal having the same contents as a signal input to a device to an external device, at an exterior part of an apparatus body including the device making information of contents including images into a state capable of being sensed by a user, and mounting fixtures mounting the device on a head portion of the user."

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Head mount display: "A head mount display includes: an image display unit at which an image is displayed; an arm that supports the image display unit while allowing an orientation of the image display unit to be adjusted; a mounting unit that supports the arm and is used to attach the head mount display to a user."

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Head-mounted display: "A headphone (3) has LEDs indicating whether a head-mounted display is used for the left eye or for the right eye. In the case shown in the attached figure, the LED of L showing that the display is used for the left eye is lit. Whether the head-mounted display is used for the left eye or for the right eye is indicated by the LEDs, and depending on whether it is used for the left eye or for the right eye, audio outputted from the headphone (3) is switched over between the left and the right. Independent of whether the head-mounted display is used for the left eye or for the right eye, audio for the right ear is outputted for the right ear and audio for the left ear is outputted for the left ear."